High-pressure gas–solid carbonation route coupled with a solid ionic liquid for rapid synthesis of rhombohedral calcite

Phase equilibria and diffusion behavior of high pressure CO 2 in tetra-n-heptyl ammonium bromide

“…was obtained from the extrapolation of the viscosity of tetrabutylammonium bromide [39] and a further equation for different chains [22,23]. In that much (also see Fig.5c and Fig.5d M a n u s c r i p t M a n u s c r i p t M a n u s c r i p t A c c e p t e d M a n u s c r i p t M a n u s c r i p t M a n u s c r i p t M a n u s c r i p t 21 Table 3 p (MPa) 10 5 η 1 (Pa·s) 10 10 D 1 0 (m 2 /s) 10 predicted; points: experimental; •, this work from FMP; ▲, from Scurto et al [12]. …”

“…Recently, Abdul found that tetra-n-heptyl ammonium bromide ([thepAm][Br]) (a non room-temperature IL) with supercritical CO 2 can enhance the production of CaCO 3 [10,11], suggesting the solubility of CO 2 in [thepAm] [Br] served as an important factor. Hence, [thepAm][Br] was proposed as an alternative candidate for trapping and capturing CO 2 .…”

Conversion of calcium sulphide to calcium carbonate during the process of recovery of elemental sulphur from gypsum waste

“…The two prevalent CaCO 3 phases can clearly be distinguished by their characteristic morphologies. Vaterite can be recognised as the lensshaped particles [30] whilst calcite was identified as rhombohedral crystallites [31]. All precipitates were micron-sized lumps made up of randomly aggregated rhombohedra of calcite and lens-shaped (or ellipse-like) vaterite.…”

Rapid Carbonation for Calcite from a Solid-Liquid-Gas System with an Imidazolium-Based Ionic Liquid

“…The SIL served as the catalyst carrier and facilitated the effective dissolution of CO 2 , leading to the syntheses of stoichiometric rhombohedral calcite phases [23,24]. In the current study, we report an SLGC involving a Ca(OH) 2 slurry system using an imidazolium-based IL in view of enhancing carbonation efficiency.…”

“…Previously, we conducted systematic research on a solid-gas carbonation (SGC) involving a dry Ca(OH) 2 system with a solid ionic liquid (SIL) and high-pressure/supercritical CO 2 and achieved the complete conversion of Ca(OH) 2 to CaCO 3 in 5 min [ 23 , 24 ]. The SIL served as the catalyst carrier and facilitated the effective dissolution of CO 2 , leading to the syntheses of stoichiometric rhombohedral calcite phases [ 23 , 24 ]. In the current study, we report an SLGC involving a Ca(OH) 2 slurry system using an imidazolium-based IL in view of enhancing carbonation efficiency.…”